Hello!
After a discussion with @bitmap recently, we decided that it is more important to upgrade our production version of Postgres from 9.5 to 12.x. On 18 May we’re going to do just that, but we’re NOT going to change the database schema at that time. We may opt to do a schema change release in the autumn.
See our blog post on this topic:
https://blog.metabrainz.org/2020/02/04/upgrading-postgres-instead-of-schema-change-18-may-2020/
Thanks!